zero

I cleaned and tested all the injectors when I replaced the orings, and also used a bottle of injector cleaner in the tank. There are no exhaust leaks. @B.M.W Ltd - do you have any advice on what it could be?

@B.M.W Ltd In your opinion, do you think something like timecerts or helicoils would be good options for a performance engine build, even if the block tested fine?

So, I'm still chasing similar codes to the ones @Ahmedsinc was. Even though I had replaced the ccv and hoses a few years ago, I replaced them again last week but the following fault code returned after about 50kms - 227: Lambda contol tolerance Bank 1. I also used a new inlet manifold gasket of course. Over my ownership I've also replaced both intake boots, both rubber bungs at the back of the manifold, new disa and its gasket, the 'f' piece and both its hoses, injector o-rings, dipstick o-rings, fuel vacuum rubber hoses, fuel filter, throttle body gasket. I've also cleaned the throttle body, the idle control valve, and the maf. I've also replaced the throttle body with another used one I had lying around, and checked and cleaned its connector. I'm pulling my hair out - anyone have any ideas?

This ^^^^^^ Go with the bigger stud if you are going to this much hassle

I could be wrong, and maybe Glenn could correct me, but I think the way it is done is they pressure test it with a florescent dye and inspect with a special light, so any cracks will show up.

You can also get thicker bolts and a jig to re-thread the holes bigger.

I'd buy them if you were in south Auckland

In NZ try Euroitalian or Milland, or import from Fcp euro or Schmeidmann

The blanking plate and gasket is alot cheaper than another secondary air pump too

Can I ask why? Most people do the air pump delete.

Talk to Kayne Barrie. He makes them and they are very good.

Mate, I was just asking, not accusing.

So its not a real 540is then? The seller is lying?

You have a jack in your boot. How else would you put on the spare tyre in the case of a puncture?

First off you need a proper tyre place. Not balancing the wheels or doing an alignment is bad advice. Somewhere like autolign will do a proper alignment. Put your old wheels on the back and see if the noise is still there